On Tue, Jul 20, 2010 at 11:27:54AM -0400, Alex Deucher wrote:
> This fixes a regression caused by b2ea4aa67bfd084834edd070e0a4a47857d6db59
> due to the way shared ddc with multiple digital connectors was handled.
>
I guess I should verify this patch still works for me..
-- Pasi
> You generally have two cases where DDC lines are shared:
> - HDMI + VGA
> - HDMI + DVI-D
>
> HDMI + VGA is easy to deal with because you can check the EDID for the
> to see if the attached monitor is digital. A shared DDC line with two
> digital connectors is more complex. You can't use the hdmi bits in the
> EDID since they may not be there with DVI<->HDMI adapters. In this case
> all we can do is check the HPD pins to see which is connected as we have
> no way of knowing using the EDID.
>
> Reported-by: trapdoor6@xxxxxxxxx
> Signed-off-by: Alex Deucher <alexdeucher@xxxxxxxxx>
> Cc: stable@xxxxxxxxxx
> ---
> drivers/gpu/drm/radeon/radeon_connectors.c | 23 +++++++++--------------
> 1 files changed, 9 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
> index f58f8bd..adccbc2 100644
> --- a/drivers/gpu/drm/radeon/radeon_connectors.c
> +++ b/drivers/gpu/drm/radeon/radeon_connectors.c
> @@ -771,14 +771,14 @@ static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connect
> } else
> ret = connector_status_connected;
>
> - /* multiple connectors on the same encoder with the same ddc line
> - * This tends to be HDMI and DVI on the same encoder with the
> - * same ddc line. If the edid says HDMI, consider the HDMI port
> - * connected and the DVI port disconnected. If the edid doesn't
> - * say HDMI, vice versa.
> + /* This gets complicated. We have boards with VGA + HDMI with a
> + * shared DDC line and we have boards with DVI-D + HDMI with a shared
> + * DDC line. The latter is more complex because with DVI<->HDMI adapters
> + * you don't really know what's connected to which port as both are digital.
> */
> if (radeon_connector->shared_ddc && (ret == connector_status_connected)) {
> struct drm_device *dev = connector->dev;
> + struct radeon_device *rdev = dev->dev_private;
> struct drm_connector *list_connector;
> struct radeon_connector *list_radeon_connector;
> list_for_each_entry(list_connector, &dev->mode_config.connector_list, head) {
> @@ -788,15 +788,10 @@ static enum drm_connector_status radeon_dvi_detect(struct drm_connector *connect
> if (list_radeon_connector->shared_ddc &&
> (list_radeon_connector->ddc_bus->rec.i2c_id ==
> radeon_connector->ddc_bus->rec.i2c_id)) {
> - if (drm_detect_hdmi_monitor(radeon_connector->edid)) {
> - if (connector->connector_type == DRM_MODE_CONNECTOR_DVID) {
> - kfree(radeon_connector->edid);
> - radeon_connector->edid = NULL;
> - ret = connector_status_disconnected;
> - }
> - } else {
> - if ((connector->connector_type == DRM_MODE_CONNECTOR_HDMIA) ||
> - (connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)) {
> + /* cases where both connectors are digital */
> + if (list_connector->connector_type != DRM_MODE_CONNECTOR_VGA) {
> + /* hpd is our only option in this case */
> + if (!radeon_hpd_sense(rdev, radeon_connector->hpd.hpd)) {
> kfree(radeon_connector->edid);
> radeon_connector->edid = NULL;
> ret = connector_status_disconnected;
> --
> 1.7.1.1
>
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